1. Connect to SQL Server and run select statements
Databases Tutorial 1
Connect to SQL Server and run select statements

2. Tutorial 1 Databases Simple selects Add comments to SQL code
Add comment to output
Continue after an error
Restrict rows
Restrict columns
Conditions

3. Simple selects
The full syntax of the SELECT statement is complex, but the main clauses can be summarized as:
SELECT select_list [INTO new_table_name] FROM table_list [WHERE search_conditions] [GROUP BY group_by_list] [HAVING search_conditions] [ORDER BY order_list [ASC | DESC] ]
In this lesson, we will address only those clauses in black.

4. Select list
Describes the columns of the result set. It is a comma-separated list of expressions.
Each expression defines both
the format (data type and size) and
the source of the data for the result set column.
Each select list expression is usually a reference to a column in the source table or view the data is coming from, but can be any other expression, such as a constant or a Transact-SQL function.
Using the * expression in a select list specifies that all columns in the source table are returned.

5. FROM table_list
Contains a list of the tables from which the result set data is retrieved. These sources can be:
Base tables in the local server running Microsoft® SQL Server™.
Views in the local SQL Server. SQL Server internally resolves a view reference to references against the base tables that make up the view. See later in the course.

6. Simplest select Select * from <table-name>
E.g. Select * from dog

7. WHERE search_conditions
The WHERE clause is a filter that defines the conditions each row in the source tables must meet to qualify for the SELECT.
Only rows that meet the conditions contribute data to the result set.
Data from rows that do not meet the conditions are not used.

8. Selection
Selection picks individual columns from a table:

9. Projection
Projection picks only rows that satisfy a condition:

10. Conditions And, or not Equal, not equal, greater than, less than.
Like, using % and –

11. Miscellaneous
To comment out parts of a query, surround the part by /*…*/
To make the analyser pick up after an error or break, use the word GO
To denote a string, use single quotes. Double quotes are not recognised.
If you want to embed a single quote (i.e. an apostrophe!) in a string, precede it with another single quote.

12. Example

13. Further exercises
Try out the ‘where’ clause on the sample database, changing the conditions.